A T-filter (R9, R10, and C2) smoothes the voltage fluctuations in U1A’s output. These fluctuations are caused by the varying current drawn by the blinking multicolor LEDs.

In the video, Markusic wore a multi-color birthday hat and a T-shirt that says "Texas Rocket Science," a nod to Firefly's headquarters in Cedar Park, just north of Austin.

A birthday cake isn’t complete without the candles, but new research suggests that when you blow them out, you’re spreading bacteria all over dessert.

Blowing out birthday candles increases bacteria on cake by 1,400%, study reveals You might want to make a wish that you don't get sick Sarah Jones Monday 31 July 2017 12:49 BST 0 Comments ...